Effect of implant structural changes on the cortical bone stress distribution and peak of the implant-bone interface: a three-dimensional finite element analysis

doi:10.3969/j.issn.2095-4344.2015.47.009

Abstract

Abstract:

BACKGROUND: The biomechanical effect of the implant-bone interface is one of the most important factors for bone resorption. The new structure of the periodontal-ligament-like implants may improve the distribution of the interfacial stress.

OBJECTIVE: To discuss the effect of the internal structure changes of traditional implants on the cortical bone stress distribution and peak at the implant-bone interface under different occlusal load conditions, so as to provide a theoretical basis for the optimization design and clinical application of new structure implants.

METHODS: Two kinds of digital models, new structure implant (model A) and non-threaded cylindrical implant (model B), were established by Pro/ENGINEER software. Variations of the stress peak and stress distribution of implant-bone interface cortical bone area under the same bone and force environment were analyzed using Ansys software.

RESULTS AND CONCLUSION: Under a vertical loading, the stress peak under different forces was reduced by 17.54% in model A compared with model B; under a 45° loading, the stress peak of model A was reduced by 2.59% compared with model B, and it showed an evident tendency of high stress area focusing to the buccal side of model B. Under the chew-simulation loading, the stress peak of model A was lower than that of model B. The biggest difference (0.353 2 MPa) appeared at β=12°(β is the angle of force direction and the implant axis), and it gradually reduced at β > 12°. At the same time, model A had a wider range of application degree compared with model B in two quantitative indicators, including optimal peak stress of promoting bone tissue growth and stress peak of maintaining healthy bone tissue. These results suggest that the optimized structure of implants contributes to improve the cortical bone stress distribution at the implant-bone interface, decrease the peak stress, and reduce the risk of cortical bone absorption in a wider range.
中国组织工程研究杂志出版内容重点：生物材料；骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性；组织工程

Key words: Dental Implants, Finite Element Analysis, Biomechanics, Stress, Mechanical, Tissue Engineering

Tong Cheng-hao, Lv Xiao-fei, Peng Cheng. Effect of implant structural changes on the cortical bone stress distribution and peak of the implant-bone interface: a three-dimensional finite element analysis[J]. Chinese Journal of Tissue Engineering Research, 2015, 19(47): 7597-7602.

Figures/Tables 4

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